508 lines
18 KiB
C++
508 lines
18 KiB
C++
/*
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* DirectoryLayer.actor.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "DirectoryLayer.h"
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#include "DirectoryPartition.h"
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namespace FDB {
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const uint8_t DirectoryLayer::LITTLE_ENDIAN_LONG_ONE[8] = {1,0,0,0,0,0,0,0};
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const StringRef DirectoryLayer::HIGH_CONTENTION_KEY = LiteralStringRef("hca");
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const StringRef DirectoryLayer::LAYER_KEY = LiteralStringRef("layer");
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const StringRef DirectoryLayer::VERSION_KEY = LiteralStringRef("version");
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const int64_t DirectoryLayer::SUB_DIR_KEY = 0;
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const uint32_t DirectoryLayer::VERSION[3] = {1, 0, 0};
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const StringRef DirectoryLayer::DEFAULT_NODE_SUBSPACE_PREFIX = LiteralStringRef("\xfe");
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const Subspace DirectoryLayer::DEFAULT_NODE_SUBSPACE = Subspace(DEFAULT_NODE_SUBSPACE_PREFIX);
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const Subspace DirectoryLayer::DEFAULT_CONTENT_SUBSPACE = Subspace();
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const StringRef DirectoryLayer::PARTITION_LAYER = LiteralStringRef("partition");
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DirectoryLayer::DirectoryLayer(Subspace nodeSubspace, Subspace contentSubspace, bool allowManualPrefixes) :
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nodeSubspace(nodeSubspace), contentSubspace(contentSubspace), allowManualPrefixes(allowManualPrefixes),
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rootNode(nodeSubspace.get(nodeSubspace.key())), allocator(rootNode.get(HIGH_CONTENTION_KEY))
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{ }
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Subspace DirectoryLayer::nodeWithPrefix(StringRef const& prefix) const {
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return nodeSubspace.get(prefix);
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}
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template<class T>
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Optional<Subspace> DirectoryLayer::nodeWithPrefix(Optional<T> const& prefix) const {
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if(!prefix.present()) {
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return Optional<Subspace>();
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}
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return nodeWithPrefix(prefix.get());
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}
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ACTOR Future<DirectoryLayer::Node> find(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path path) {
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state int pathIndex = 0;
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state DirectoryLayer::Node node = DirectoryLayer::Node(dirLayer, dirLayer->rootNode, IDirectory::Path(), path);
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for(; pathIndex != path.size(); ++pathIndex) {
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ASSERT(node.subspace.present());
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Optional<FDBStandalone<ValueRef>> val = wait(tr->get(node.subspace.get().get(DirectoryLayer::SUB_DIR_KEY).get(path[pathIndex], true).key()));
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node.path.push_back(path[pathIndex]);
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node = DirectoryLayer::Node(dirLayer, dirLayer->nodeWithPrefix(val), node.path, path);
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DirectoryLayer::Node _node = wait(node.loadMetadata(tr));
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node = _node;
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if(!node.exists() || node.layer == DirectoryLayer::PARTITION_LAYER) {
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return node;
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}
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}
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if(!node.loadedMetadata) {
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DirectoryLayer::Node _node = wait(node.loadMetadata(tr));
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node = _node;
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}
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return node;
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}
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IDirectory::Path DirectoryLayer::toAbsolutePath(IDirectory::Path const& subpath) const {
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Path path;
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path.reserve(this->path.size() + subpath.size());
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path.insert(path.end(), this->path.begin(), this->path.end());
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path.insert(path.end(), subpath.begin(), subpath.end());
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return path;
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}
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Reference<DirectorySubspace> DirectoryLayer::contentsOfNode(Subspace const& node, Path const& path, Standalone<StringRef> const& layer) {
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Standalone<StringRef> prefix = nodeSubspace.unpack(node.key()).getString(0);
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if(layer == PARTITION_LAYER) {
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return Reference<DirectorySubspace>(new DirectoryPartition(toAbsolutePath(path), prefix, Reference<DirectoryLayer>::addRef(this)));
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}
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else {
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return Reference<DirectorySubspace>(new DirectorySubspace(toAbsolutePath(path), prefix, Reference<DirectoryLayer>::addRef(this), layer));
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}
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}
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Reference<DirectorySubspace> DirectoryLayer::openInternal(Standalone<StringRef> const& layer, Node const& existingNode, bool allowOpen) {
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if (!allowOpen) {
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throw directory_already_exists();
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}
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if(layer.size() > 0 && layer != existingNode.layer) {
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throw mismatched_layer();
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}
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return existingNode.getContents();
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}
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Future<Reference<DirectorySubspace>> DirectoryLayer::open(Reference<Transaction> const& tr, Path const& path, Standalone<StringRef> const& layer) {
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return createOrOpenInternal(tr, path, layer, Optional<Standalone<StringRef>>(), false, true);
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}
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void DirectoryLayer::initializeDirectory(Reference<Transaction> const& tr) const {
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tr->set(rootNode.pack(VERSION_KEY), StringRef((uint8_t*)VERSION, 12));
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}
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ACTOR Future<Void> checkVersionInternal(const DirectoryLayer* dirLayer, Reference<Transaction> tr, bool writeAccess) {
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Optional<FDBStandalone<ValueRef>> versionBytes = wait(tr->get(dirLayer->rootNode.pack(DirectoryLayer::VERSION_KEY)));
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if(!versionBytes.present()) {
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if(writeAccess) {
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dirLayer->initializeDirectory(tr);
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}
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return Void();
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}
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else {
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if(versionBytes.get().size() != 12) {
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throw invalid_directory_layer_metadata();
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}
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if(((uint32_t*)versionBytes.get().begin())[0] > DirectoryLayer::VERSION[0]) {
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throw incompatible_directory_version();
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}
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else if(((uint32_t*)versionBytes.get().begin())[1] > DirectoryLayer::VERSION[1] && writeAccess) {
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throw incompatible_directory_version();
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}
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}
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return Void();
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}
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Future<Void> DirectoryLayer::checkVersion(Reference<Transaction> const& tr, bool writeAccess) const {
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return checkVersionInternal(this, tr, writeAccess);
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}
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ACTOR Future<Standalone<StringRef>> getPrefix(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, Optional<Standalone<StringRef>> prefix) {
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if(!prefix.present()) {
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Standalone<StringRef> allocated = wait(dirLayer->allocator.allocate(tr));
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state Standalone<StringRef> finalPrefix = allocated.withPrefix(dirLayer->contentSubspace.key());
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FDBStandalone<RangeResultRef> result = wait(tr->getRange(KeyRangeRef(finalPrefix, strinc(finalPrefix)), 1));
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if(result.size() > 0) {
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throw directory_prefix_not_empty();
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}
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return finalPrefix;
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}
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return prefix.get();
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}
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ACTOR Future<Optional<Subspace>> nodeContainingKey(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, Standalone<StringRef> key, bool snapshot) {
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if(key.startsWith(dirLayer->nodeSubspace.key())) {
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return dirLayer->rootNode;
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}
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KeyRange range = KeyRangeRef(dirLayer->nodeSubspace.range().begin, keyAfter(dirLayer->nodeSubspace.pack(key)));
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FDBStandalone<RangeResultRef> result = wait(tr->getRange(range, 1, snapshot, true));
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if(result.size() > 0) {
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Standalone<StringRef> prevPrefix = dirLayer->nodeSubspace.unpack(result[0].key).getString(0);
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if(key.startsWith(prevPrefix)) {
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return dirLayer->nodeWithPrefix(prevPrefix);
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}
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}
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return Optional<Subspace>();
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}
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ACTOR Future<bool> isPrefixFree(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, Standalone<StringRef> prefix, bool snapshot){
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if(!prefix.size()) {
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return false;
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}
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Optional<Subspace> node = wait(nodeContainingKey(dirLayer, tr, prefix, snapshot));
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if(node.present()) {
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return false;
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}
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FDBStandalone<RangeResultRef> result = wait(tr->getRange(KeyRangeRef(dirLayer->nodeSubspace.pack(prefix), dirLayer->nodeSubspace.pack(strinc(prefix))), 1, snapshot));
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return !result.size();
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}
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ACTOR Future<Subspace> getParentNode(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path path) {
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if(path.size() > 1) {
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Reference<DirectorySubspace> parent = wait(dirLayer->createOrOpenInternal(tr, IDirectory::Path(path.begin(), path.end() - 1), StringRef(), Optional<Standalone<StringRef>>(), true, true));
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return dirLayer->nodeWithPrefix(parent->key());
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}
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else {
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return dirLayer->rootNode;
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}
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}
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ACTOR Future<Reference<DirectorySubspace>> createInternal(
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Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path path,
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Standalone<StringRef> layer, Optional<Standalone<StringRef>> prefix, bool allowCreate)
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{
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if(!allowCreate) {
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throw directory_does_not_exist();
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}
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wait(dirLayer->checkVersion(tr, true));
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state Standalone<StringRef> newPrefix = wait(getPrefix(dirLayer, tr, prefix));
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bool isFree = wait(isPrefixFree(dirLayer, tr, newPrefix, !prefix.present()));
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if(!isFree) {
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throw directory_prefix_in_use();
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}
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Subspace parentNode = wait(getParentNode(dirLayer, tr, path));
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Subspace node = dirLayer->nodeWithPrefix(newPrefix);
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tr->set(parentNode.get(DirectoryLayer::SUB_DIR_KEY).get(path.back(), true).key(), newPrefix);
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tr->set(node.get(DirectoryLayer::LAYER_KEY).key(), layer);
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return dirLayer->contentsOfNode(node, path, layer);
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}
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ACTOR Future<Reference<DirectorySubspace>> _createOrOpenInternal(
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Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path path,
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Standalone<StringRef> layer, Optional<Standalone<StringRef>> prefix, bool allowCreate, bool allowOpen)
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{
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ASSERT(!prefix.present() || allowCreate);
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wait(dirLayer->checkVersion(tr, false));
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if(prefix.present() && !dirLayer->allowManualPrefixes) {
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if(!dirLayer->getPath().size()) {
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throw manual_prefixes_not_enabled();
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}
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else {
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throw prefix_in_partition();
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}
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}
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if(!path.size()){
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throw cannot_open_root_directory();
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}
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state DirectoryLayer::Node existingNode = wait(find(dirLayer, tr, path));
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if(existingNode.exists()) {
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if(existingNode.isInPartition()) {
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IDirectory::Path subpath = existingNode.getPartitionSubpath();
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Reference<DirectorySubspace> dirSpace = wait(existingNode.getContents()->getDirectoryLayer()->createOrOpenInternal(tr, subpath, layer, prefix, allowCreate, allowOpen));
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return dirSpace;
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}
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return dirLayer->openInternal(layer, existingNode, allowOpen);
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}
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else {
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Reference<DirectorySubspace> dirSpace = wait(createInternal(dirLayer, tr, path, layer, prefix, allowCreate));
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return dirSpace;
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}
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}
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Future<Reference<DirectorySubspace>> DirectoryLayer::createOrOpenInternal(
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Reference<Transaction> const& tr, Path const& path, Standalone<StringRef> const& layer,
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Optional<Standalone<StringRef>> const& prefix, bool allowCreate, bool allowOpen)
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{
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return _createOrOpenInternal(Reference<DirectoryLayer>::addRef(this), tr, path, layer, prefix, allowCreate, allowOpen);
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}
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Future<Reference<DirectorySubspace>> DirectoryLayer::create(
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Reference<Transaction> const& tr, Path const& path, Standalone<StringRef> const& layer,
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Optional<Standalone<StringRef>> const& prefix)
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{
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return createOrOpenInternal(tr, path, layer, prefix, true, false);
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}
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Future<Reference<DirectorySubspace>> DirectoryLayer::createOrOpen(Reference<Transaction> const& tr, Path const& path, Standalone<StringRef> const& layer) {
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return createOrOpenInternal(tr, path, layer, Optional<Standalone<StringRef>>(), true, true);
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}
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ACTOR Future<Standalone<VectorRef<StringRef>>> listInternal(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path path) {
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wait(dirLayer->checkVersion(tr, false));
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state DirectoryLayer::Node node = wait(find(dirLayer, tr, path));
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if(!node.exists()) {
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throw directory_does_not_exist();
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}
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if(node.isInPartition(true)) {
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Standalone<VectorRef<StringRef>> partitionList = wait(node.getContents()->getDirectoryLayer()->list(tr, node.getPartitionSubpath()));
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return partitionList;
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}
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state Subspace subdir = node.subspace.get().get(DirectoryLayer::SUB_DIR_KEY);
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state Key begin = subdir.range().begin;
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state Standalone<VectorRef<StringRef>> subdirectories;
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loop {
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FDBStandalone<RangeResultRef> subdirRange = wait(tr->getRange(KeyRangeRef(begin, subdir.range().end)));
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for(int i = 0; i < subdirRange.size(); ++i) {
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subdirectories.push_back_deep(subdirectories.arena(), subdir.unpack(subdirRange[i].key).getString(0));
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}
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if(!subdirRange.more) {
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return subdirectories;
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}
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begin = keyAfter(subdirRange.back().key);
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}
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}
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Future<Standalone<VectorRef<StringRef>>> DirectoryLayer::list(Reference<Transaction> const& tr, Path const& path) {
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return listInternal(Reference<DirectoryLayer>::addRef(this), tr, path);
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}
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bool pathsEqual(IDirectory::Path const& path1, IDirectory::Path const& path2, size_t maxElementsToCheck = std::numeric_limits<size_t>::max()) {
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if(std::min(path1.size(), maxElementsToCheck) != std::min(path2.size(), maxElementsToCheck)) {
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return false;
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}
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for(int i = 0; i < path1.size() && i < maxElementsToCheck; ++i) {
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if(path1[i] != path2[i]) {
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return false;
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}
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}
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return true;
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}
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ACTOR Future<Void> removeFromParent(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path path) {
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ASSERT(path.size() >= 1);
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DirectoryLayer::Node parentNode = wait(find(dirLayer, tr, IDirectory::Path(path.begin(), path.end() - 1)));
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if(parentNode.subspace.present()) {
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tr->clear(parentNode.subspace.get().get(DirectoryLayer::SUB_DIR_KEY).get(path.back(), true).key());
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}
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return Void();
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}
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ACTOR Future<Reference<DirectorySubspace>> moveInternal(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path oldPath, IDirectory::Path newPath) {
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wait(dirLayer->checkVersion(tr, true));
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if(oldPath.size() <= newPath.size()) {
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if(pathsEqual(oldPath, newPath, oldPath.size())) {
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throw invalid_destination_directory();
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}
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}
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std::vector<Future<DirectoryLayer::Node>> futures;
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futures.push_back(find(dirLayer, tr, oldPath));
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futures.push_back(find(dirLayer, tr, newPath));
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std::vector<DirectoryLayer::Node> nodes = wait(getAll(futures));
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state DirectoryLayer::Node oldNode = nodes[0];
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state DirectoryLayer::Node newNode = nodes[1];
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if(!oldNode.exists()) {
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throw directory_does_not_exist();
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}
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if(oldNode.isInPartition() || newNode.isInPartition()) {
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if(!oldNode.isInPartition() || !newNode.isInPartition() || !pathsEqual(oldNode.path, newNode.path)) {
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throw cannot_move_directory_between_partitions();
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}
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Reference<DirectorySubspace> partitionMove = wait(newNode.getContents()->move(tr, oldNode.getPartitionSubpath(), newNode.getPartitionSubpath()));
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return partitionMove;
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}
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if(newNode.exists() || newPath.empty()) {
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throw directory_already_exists();
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}
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DirectoryLayer::Node parentNode = wait(find(dirLayer, tr, IDirectory::Path(newPath.begin(), newPath.end() - 1)));
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if(!parentNode.exists()) {
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throw parent_directory_does_not_exist();
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}
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tr->set(parentNode.subspace.get().get(DirectoryLayer::SUB_DIR_KEY).get(newPath.back(), true).key(), dirLayer->nodeSubspace.unpack(oldNode.subspace.get().key()).getString(0));
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wait(removeFromParent(dirLayer, tr, oldPath));
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return dirLayer->contentsOfNode(oldNode.subspace.get(), newPath, oldNode.layer);
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}
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Future<Reference<DirectorySubspace>> DirectoryLayer::move(Reference<Transaction> const& tr, Path const& oldPath, Path const& newPath) {
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return moveInternal(Reference<DirectoryLayer>::addRef(this), tr, oldPath, newPath);
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}
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Future<Reference<DirectorySubspace>> DirectoryLayer::moveTo(Reference<Transaction> const& tr, Path const& newAbsolutePath) {
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throw cannot_modify_root_directory();
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}
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Future<Void> removeRecursive(Reference<DirectoryLayer> const&, Reference<Transaction> const&, Subspace const&);
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ACTOR Future<Void> removeRecursive(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, Subspace nodeSub) {
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state Subspace subdir = nodeSub.get(DirectoryLayer::SUB_DIR_KEY);
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state Key begin = subdir.range().begin;
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state std::vector<Future<Void>> futures;
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loop {
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FDBStandalone<RangeResultRef> range = wait(tr->getRange(KeyRangeRef(begin, subdir.range().end)));
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for (int i = 0; i < range.size(); ++i) {
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Subspace subNode = dirLayer->nodeWithPrefix(range[i].value);
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futures.push_back(removeRecursive(dirLayer, tr, subNode));
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}
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if(!range.more) {
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break;
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}
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begin = keyAfter(range.back().key);
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}
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// waits are done concurrently
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wait(waitForAll(futures));
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Standalone<StringRef> nodePrefix = dirLayer->nodeSubspace.unpack(nodeSub.key()).getString(0);
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tr->clear(KeyRangeRef(nodePrefix, strinc(nodePrefix)));
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tr->clear(nodeSub.range());
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return Void();
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}
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Future<bool> removeInternal(Reference<DirectoryLayer> const&, Reference<Transaction> const&, IDirectory::Path const&, bool const&);
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ACTOR Future<bool> removeInternal(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path path, bool failOnNonexistent) {
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wait(dirLayer->checkVersion(tr, true));
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if(path.empty()) {
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throw cannot_modify_root_directory();
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}
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state DirectoryLayer::Node node = wait(find(dirLayer, tr, path));
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if(!node.exists()) {
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if(failOnNonexistent) {
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throw directory_does_not_exist();
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}
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else {
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return false;
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}
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}
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if(node.isInPartition()) {
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bool recurse = wait(removeInternal(node.getContents()->getDirectoryLayer(), tr, node.getPartitionSubpath(), failOnNonexistent));
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return recurse;
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}
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state std::vector<Future<Void>> futures;
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futures.push_back(removeRecursive(dirLayer, tr, node.subspace.get()));
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futures.push_back(removeFromParent(dirLayer, tr, path));
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wait(waitForAll(futures));
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return true;
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}
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Future<Void> DirectoryLayer::remove(Reference<Transaction> const& tr, Path const& path) {
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return success(removeInternal(Reference<DirectoryLayer>::addRef(this), tr, path, true));
|
|
}
|
|
|
|
Future<bool> DirectoryLayer::removeIfExists(Reference<Transaction> const& tr, Path const& path) {
|
|
return removeInternal(Reference<DirectoryLayer>::addRef(this), tr, path, false);
|
|
}
|
|
|
|
ACTOR Future<bool> existsInternal(Reference<DirectoryLayer> dirLayer, Reference<Transaction> tr, IDirectory::Path path) {
|
|
wait(dirLayer->checkVersion(tr, false));
|
|
|
|
DirectoryLayer::Node node = wait(find(dirLayer, tr, path));
|
|
|
|
if(!node.exists()) {
|
|
return false;
|
|
}
|
|
|
|
if(node.isInPartition()) {
|
|
bool exists = wait(node.getContents()->getDirectoryLayer()->exists(tr, node.getPartitionSubpath()));
|
|
return exists;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
Future<bool> DirectoryLayer::exists(Reference<Transaction> const& tr, Path const& path) {
|
|
return existsInternal(Reference<DirectoryLayer>::addRef(this), tr, path);
|
|
}
|
|
|
|
Reference<DirectoryLayer> DirectoryLayer::getDirectoryLayer() {
|
|
return Reference<DirectoryLayer>::addRef(this);
|
|
}
|
|
|
|
const Standalone<StringRef> DirectoryLayer::getLayer() const {
|
|
return StringRef();
|
|
}
|
|
|
|
const IDirectory::Path DirectoryLayer::getPath() const {
|
|
return path;
|
|
}
|
|
}
|